CN114696497A

CN114696497A - Refrigerating system, motor thereof and glue filling method of motor

Info

Publication number: CN114696497A
Application number: CN202210403805.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-07-01

Abstract

The invention discloses a refrigerating system, a motor thereof and a glue filling method of the motor, wherein the motor comprises a stator, a rotor, a rotating shaft and an integrally formed fan; the fan hub of the fan is provided with a first annular shell and a second annular shell surrounding the first annular shell; the upper end of pivot is embedded in first annular shell and moulds plastics as an organic wholely with first annular shell, and the yoke of rotor is embedded in second annular shell and moulds plastics as an organic wholely with second annular shell, so sets up, makes the rotating member of this motor have better uniformity, and makes the terminal surface runout amount of rotating member, unbalance amount isoparametric easier control to make motor operate steadily, the running noise is little. In addition, this motor is still including fixing the PCB board at the stator lower extreme and setting up in the automatically controlled constitution of PCB board, and PCB board and automatically controlled constitution are all sealed by the casting glue, so set up, can prevent that PCB board and automatically controlled constitution from weing the inefficacy, have reduced the fault rate that PCB board and automatically controlled constitute.

Description

Refrigerating system, motor thereof and glue filling method of motor

Technical Field

The invention relates to the technical field of motors, in particular to a motor of a refrigerating system and a glue filling method of the motor.

Background

In some refrigeration systems, such as air-cooled refrigerators, a motor equipped with a fan is typically employed. The structure generally comprises components such as a rotor, a rotating shaft, a magnetic yoke, a fan and the like, and then the components are assembled together in a press-fitting mode to form a structural body. Imbalance of motion and vibration may occur between the parts, resulting in relatively loud noise.

In view of this, it is a technical problem to be solved by those skilled in the art to develop a motor for a refrigeration system, which operates more smoothly and generates less noise.

Disclosure of Invention

In order to solve the technical problem, the invention provides a motor of a refrigeration system, which comprises a stator, a rotor, a rotating shaft and an integrally formed fan; the fan hub has a first annular shell and a second annular shell surrounding the first annular shell; the upper end of the rotating shaft is embedded in the first annular shell and is integrally formed with the first annular shell in an injection molding mode, and the magnet yoke of the rotor is embedded in the second annular shell and is integrally formed with the second annular shell in an injection molding mode.

So set up, the yoke and the fan that make pivot, rotor form a whole of moulding plastics, compare with each pressure equipment together or with each through the structure that other connecting pieces link together and form, have better uniformity, end face bounce amount, unbalance amount isoparametric are changeed and are controlled to make the operation of fan more steady, the noise is littleer. Moreover, the jumping degree, the concentricity and the like of the fan blades do not need to be adjusted repeatedly in the manufacturing process, the manufacturing process is simpler, and the manufacturing cost is lower.

In addition, the invention also provides a refrigerating system which comprises a motor, wherein the motor is any one of the motors.

In addition, the invention also provides a glue pouring method of the motor, which comprises the following steps:

firstly, configuring a wire protecting sleeve with the shape matched with the wire outlet and the hole shape matched with the lead, and sleeving the wire protecting sleeve on the lead;

then, fixedly sleeving the stator on the periphery of the third annular shell, so that the PCB and the electronic control assembly are positioned in the annular groove;

then, the wire protecting sleeve is arranged at the wire outlet;

and finally, pouring the pouring sealant.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the motor provided in the present invention;

FIG. 2 is an exploded view of an embodiment;

FIG. 3 is a cross-sectional view of an embodiment;

FIG. 4 is a schematic structural view of an injection molding entity in an embodiment;

FIG. 5 is a schematic view of the components within the shaft bore of an exemplary embodiment;

fig. 6 is a schematic structural diagram of an elastic limiting element in an embodiment.

Wherein the reference numerals in fig. 1 to 4 are explained as follows:

a, injection molding of a whole;

1 fan, 11 fan hub, 111 first annular shell, 112 second annular shell, 113 upper end shell, 12 fan blades and 13 fan frame;

2, a base, 21 a third annular shell, 22 a fourth annular shell, 221 an outlet, 23 a lower end shell, 24 an annular frame and 25 lugs;

the bearing comprises a circular groove a, an 1 pouring sealant a, an axle hole b, a1 magnetic box b2 magnetic sheet b3 graphite sheet b4 elastic limiting piece, a through hole b41, a 42 elongated hole b5 bearing;

3, rotor, 31 magnetic yoke, 32 magnetic ring;

4, a rotating shaft and 41 limit grooves;

5 stator, 51 iron core, 52 skeleton, 53 winding;

6, a PCB board;

7 electric control component, 71 chip, 72 peripheral function circuit;

8 conducting wires.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic overall structure diagram of an embodiment of the motor provided in the present invention; FIG. 2 is an exploded view of an embodiment; FIG. 3 is a cross-sectional view of an embodiment; FIG. 4 is a schematic structural view of an injection molding entity in an embodiment; FIG. 5 is a schematic view of the components within the shaft bore of an exemplary embodiment; fig. 6 is a schematic structural diagram of an elastic limiting element in an embodiment.

It should be noted that, above and below, the above and below are based on the perspective of fig. 1 to 3, which are intended to clearly express the technical solutions and should not be understood as the limitation of the technical solutions.

As shown in fig. 1-3, the motor includes a fan 1, a base 2, a rotor 3, a rotating shaft 4, a stator 5, a PCB 6, an electronic control component 7, and a conducting wire 8.

The structure, function and connection between these components are explained in detail below:

fan 1

As shown in fig. 2 and 3, the fan 1 includes a hub 11, fan blades 12 and a fan frame 13, which are integrally formed, specifically, injection-molded.

As shown in fig. 2 and 3, the hub 11 has a first annular shell 111, a second annular shell 112, and an upper end shell 113. Wherein the second annular shell 112 is disposed around the first annular shell 111 and is coaxial with the first annular shell 111. Wherein the upper end case 113 is disposed at the upper ends of the first and second

annular cases

111 and 112.

Base 2

As shown in fig. 2 and 3, the base 2 includes a third annular shell 21, a fourth annular shell 22, a lower end shell 23, an annular shelf 24, and lugs 25.

Wherein the third annular shell 21 surrounds the shaft hole b, and the upper end of the third annular shell 21 extends into the second annular shell 112.

Wherein, the fourth annular shell 22 is disposed around the third annular shell 21 and is coaxial with the third annular shell 21, and an outlet 221 is disposed on the fourth annular shell 22.

Wherein the lower end shell 23 closes the bottom ends of the third and fourth annular shells 21, 22. The third annular shell 21, the fourth annular shell 22 and the lower end shell 23 together enclose an annular groove a.

Wherein the annular shelf 24 is disposed around the fourth annular shell 22.

Wherein, lugs 25 are provided on the outer periphery of the ring frame 24, and each lug 25 is provided with a coupling hole.

Rotor 3 and shaft 4

As shown in fig. 3, rotor 3 includes a yoke 31 and a magnetic ring 32 embedded inside yoke 31. The yoke 31 is fitted into the second annular case 112 and is integrally injection-molded with the second annular case 112.

As shown in fig. 3, the upper end of the rotating shaft 4 is embedded in the first annular housing 111, and is integrally injection-molded with the first annular housing 111.

With such an arrangement, as shown in fig. 4, the rotating shaft 4, the magnetic yoke 31 of the rotor 3 and the fan 1 form an injection molding whole a, and compared with a structural body formed by press-fitting the rotating shaft 4, the magnetic yoke 31 of the rotor 3 and the fan 1 together or connecting the rotating shaft 4, the magnetic yoke and the fan together through other connecting pieces, the magnetic coupling structure has better consistency, and parameters such as end face jumping quantity, unbalance quantity and the like are easier to control, so that the fan 1 runs more stably and the noise is lower. The structure formed by press-fitting and assembling the parts has the disadvantages that during operation, the end face runout and vibration are relatively more serious, larger noise is generated, and the noise requirement of a refrigerating system can not be met (for example, the noise requirement of the whole refrigerator is 40 dB/m). And when the motor is installed in a refrigerating system for use, the service life of an electric noise piece of the motor is short, and the failure rate is relatively high.

In addition, in the structure provided by the embodiment, since the fan blades and the rotor are integrally molded, repeated adjustment of the runout degree, the concentricity and the like of the fan blades 12 is not required in the manufacturing process, the manufacturing process is simpler, and the manufacturing cost is lower.

Specifically, as shown in fig. 5, the lower end of the rotating shaft 4 extends into the shaft hole b, and a bearing b5 is provided in the shaft hole b, the inner peripheral surface of the bearing b5 is fitted to the outer peripheral surface of the rotating shaft 4, and the outer peripheral surface of the bearing b5 is fitted to the inner peripheral wall of the third annular shell 21.

Further, as shown in fig. 5, a limiting groove 41 is provided at the lower end of the rotating shaft 4, and an elastic limiting member b4 is provided in the shaft hole b. The elastic limiting member b4 has a through hole b41, the rotating shaft 4 passes through the through hole b41, and the inner edge of the elastic limiting member b4 extends into the limiting groove 41.

It can be understood that the diameter of the through hole b41 is smaller than the diameter of the lower end of the rotating shaft 4, therefore, the limiting member is set as the elastic limiting member b4, when the rotating shaft 4 is assembled, the lower end of the rotating shaft 4 will push the elastic limiting member b4 to deform, so that the rotating shaft 4 can smoothly pass through the through hole b 41.

By providing the limiting groove 41 and the elastic limiting piece b4 as described above, after the rotating shaft 4 moves upward for a certain distance, the lower end surface of the elastic limiting piece b4 abuts against the lower groove wall of the limiting groove 41, so as to limit the rotating shaft 4 to continue moving upward, thereby preventing the rotating shaft 4 and the fan 1, the magnetic yoke 31 and other components integrally arranged therewith from separating from the base 2.

In a specific embodiment, as shown in fig. 6, a plurality of (three in the figure) elongated holes b42 communicating with the through hole b41 are arranged at intervals around the through hole b41 of the elastic limiting piece b4, and a lobe is formed between adjacent elongated holes b 42. So set up, when assembling pivot 4, the lower extreme of pivot 4 supports downwards and pushes away each lamella body, and each lamella body is down out of shape, makes through-hole b41 open greatly, is convenient for the assembly of pivot 4 from this.

Further, the lower end of the rotating shaft 4 has magnetism, and as shown in fig. 5, a magnetic box b1 is installed at the bottom of the shaft hole b, and a magnetic sheet b2 is arranged in the magnetic box b 1. The magnetic sheet b2 is located right below the rotating shaft 4, and specifically, a graphite sheet b3 is further arranged between the magnetic sheet b2 and the rotating shaft 4.

With this arrangement, the magnetic sheet b2 attracts the rotary shaft 4 in the axial direction, so that the axial vibration of the fan 1 can be reduced, whereby the noise can be further reduced.

Stator 5

As shown in fig. 3, the stator 5 is fixed to the outer periphery of the third annular housing 21 and is located in the inner hole of the rotor 3. Specifically, the stator 5 includes a core 51, a bobbin 52, and a winding 53 wound around the core and the bobbin. More specifically, the core 51 is a tapered air gap core 51, and the starting dead point can be avoided by using the tapered air gap core 51.

PCB 6, electric control component 7 and lead 8

As shown in fig. 3, the PCB board 6 is fixed to the lower end of the stator 5. The electric control component 7 is fixed on the lower end face of the PCB 6. One end of the conducting wire 8 is electrically connected with the electric control component 7, and the other end thereof extends out of the outlet 221. After the stator 5 is assembled in place, the PCB 6 and the electronic control component 7 are both positioned in the annular groove a of the base 2. And, the annular groove a is filled with a pouring sealant a1 to seal the PCB board 6 and the electronic control component 7.

So set up, when setting up the motor in refrigerating system's inside, can make PCB board 6 and automatically controlled 7 of constituteing avoid the infringement of the inside condensation or the water droplet that forms of refrigerating system, avoid PCB board 6 and automatically controlled 7 of constituteing and wet the problem of inefficacy, moreover, can also play insulating and fire-retardant effect.

Preferably, the potting adhesive a1 is a two-component electronic heat-dissipating silica gel. This type of silica gel has good low temperature resistance (can withstand low temperatures as low as-60 ℃), so that the problem of low temperature failure can be circumvented. Moreover, the silica gel has good heat conduction performance, is beneficial to heat dissipation of the PCB 6 and the electric control component 7, and further avoids the problem of overheating failure of the PCB 6 and the electric control component 7.

Specifically, as shown in fig. 3, the electronic control component 7 includes a chip 71 and a peripheral function circuit 72 electrically connected to the chip 71 to implement the function of the chip 71.

More specifically, the chip 71 integrates a hall position sensor function, a PWM speed regulation function, an active soft switching function, a reverse voltage function, a rotor 3 locking function, an undervoltage function, a thermal shutdown function, an FG output protection function, an ESD protection function, and the like

The PWM speed regulation function is to regulate the rotation speed by adjusting the duty ratio of the PWM signal. The speed regulation mode has higher regulation precision (the regulation error is less than +/-2%); moreover, when the input PWM is in a low duty ratio, a large torque can be provided, and the rotor 3 can be started normally; further, once the rotation of the rotor 3 is detected, the output is linearly adjusted according to the duty ratio of the input PWM, so that the minimum rotational speed output can be set as required.

Wherein, the soft switch function of initiative: the peak current generated during starting can be eliminated, the commutation time can be automatically adjusted without depending on the magnetic field intensity of the rotor 3 under the condition of not increasing the power consumption, and therefore the commutation noise of the motor is reduced, and the motor can have excellent low-noise performance at any rotating speed.

Also, the chip 71 may integrate a pull-up resistor between the PWM and its voltage input pin to reduce the electrical components of the peripheral function circuitry 72.

More specifically, the electric devices of the peripheral function circuit 72 include:

the fuse plays a role in short circuit protection;

the first transient diode plays a role in anti-surge and overvoltage protection;

the capacitor and the second transient diode play a role in absorbing counter potential;

a first resistor for applying a low voltage dc power supply of an external control board to the chip 71;

and the second resistor plays a role in level pulling.

In addition, the invention also provides a refrigerating system which is provided with the motor, and the refrigerating system can be a refrigerator.

In addition, the invention also provides a glue filling method, which comprises the following steps:

firstly, a wire protecting sleeve is configured, the shape of which is matched with the wire outlet 221 and the hole shape of which is matched with the lead 8, and the wire protecting sleeve is sleeved on the lead 8;

then, the stator 5 is assembled in place, so that the PCB 6 and the electric control component 7 are positioned in the annular groove a of the base 2;

then, as shown in fig. 4, the grommet is mounted on the outlet 221;

then, the potting adhesive a1 is poured.

The refrigeration system, the motor thereof and the glue filling method of the motor provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The motor of the refrigerating system is characterized by comprising a stator (5), a rotor (3), a rotating shaft (4) and an integrally formed fan (1); the hub (11) of the fan (1) has a first annular shell (111) and a second annular shell (112) surrounding the first annular shell (111); the upper end of the rotating shaft (4) is embedded in the first annular shell (111) and is integrally molded with the first annular shell (111) in an injection mode, and the magnetic yoke (31) of the rotor (3) is embedded in the second annular shell (112) and is integrally molded with the second annular shell (112) in an injection mode.

2. The machine according to claim 1, characterized in that it further comprises a base (2), said base (2) having a third annular shell (21), a fourth annular shell (22) surrounding said third annular shell (21), a lower end shell (23) closing the bottom ends of said third annular shell (21) and said fourth annular shell (22); the third annular shell (21), the fourth annular shell (22) and the lower end shell (23) jointly enclose an annular groove (a); the motor comprises a PCB (6) fixed at the lower end of the stator (5) and an electric control assembly (7) fixed on the PCB (6); the stator (5) is fixedly sleeved on the periphery of the third annular shell (21), and the PCB (6) and the electric control assembly (7) are both positioned in the annular groove (a); pouring sealant (a1) into the annular groove (a) to seal the PCB (6) and the electric control assembly (7).

3. The machine according to claim 2, characterized in that the third annular shell (21) encloses a shaft hole (b) into which the lower end of the rotating shaft (4) extends; the lower extreme of pivot (4) has magnetism, install magnetic sheet (b2) in shaft hole (b), magnetic sheet (b2) are located under pivot (4), in order to follow the axial attraction pivot (4).

4. The electric machine according to claim 3, characterized in that the periphery of the rotating shaft (4) is provided with a limiting groove (41), an elastic limiting piece (b4) is installed in the shaft hole (b), and the elastic limiting piece (b4) is provided with a through hole (b 41); the rotating shaft (4) penetrates through the through hole (b41), and the inner edge of the elastic limiting piece (b4) extends into the limiting groove (41).

5. The machine according to claim 2, characterized in that said electronic control assembly (7) comprises a chip (71), said chip (71) integrating a hall position sensor function, a PWM speed regulation function and an active soft switching function.

6. An electric machine according to claim 5, characterized in that said electronic control unit (7) further comprises peripheral function circuitry (72) implementing the function of said chip (71).

7. The machine according to claim 2, wherein the potting adhesive (a1) is a two-component electronic heat-dissipating silicone.

8. An electric machine according to any of claims 2-7, characterized in that the electric machine further comprises a wire (8); the fourth annular shell (22) is provided with an outlet (221); one end of the lead (8) is electrically connected with the electric control component (7), and the other end of the lead extends out of the outlet (221).

9. The method of claim 8, wherein the method comprises:

firstly, a wire protecting sleeve is configured, the shape of the wire protecting sleeve is matched with the wire outlet (221), the hole shape of the wire protecting sleeve is matched with the lead (8), and the wire protecting sleeve is sleeved on the lead (8);

then, assembling the stator (5) in place, so that the PCB (6) and the electronic control component (7) are both positioned in the annular groove (a);

then, the wire sheath is arranged at the wire outlet (221);

thereafter, the potting adhesive (a1) is poured.

10. A refrigeration system comprising an electric motor, characterized in that the electric motor is an electric motor according to any of claims 1-8.